Question

From the symbol 19k40 state 

(1) mass number of potassium 

(2) atomic number of potassium 

(3) write the distribution of electrons in an atom of potassium.

Answer 1

1. The mass number of potassium (A)= 40 

2. The atomic number of potassium (Z)=19 

3. The electronic configuration of potassium

 = 1S² , 2S²2Ps 3S²3P⁶, 4S₁